Sensitivity improvement in hidden photon detection using resonant cavities

TL;DR

This paper proposes a novel resonant cavity setup with optimized geometry and superconducting RF technology to significantly enhance the detection sensitivity of hidden photons in the microelectronvolt mass range.

Contribution

It introduces a new cavity configuration and explores superconducting RF technology to improve hidden photon detection sensitivity.

Findings

Optimized cavity geometry and mode for maximum sensitivity.

Integration of superconducting RF technology enhances detection capabilities.

Sensitivity to kinetic mixing parameter improved by orders of magnitude.

Abstract

Analogous to the light-shining-through-wall setup proposed for axion-like particle searches, a pair of resonant cavities have been considered to search for an extra U(1) massive gauge boson, called a hidden photon, which mediates the interactions in the hidden sector. We propose a new cavity configuration, consisting of a cylindrical emitter surrounded by a hollow cylindrical detector to remarkably improve experimental sensitivity to hidden photon signals in the $\mu$eV mass range. An extensive study was conducted to find the optimal cavity geometry and resonant mode, which yields the best performance. In addition, a feasible application of superconducting RF technology was explored. We found the integration of these potential improvements will enhance the sensitivity to the effective kinetic mixing parameter between the hidden photon and the Standard Model photon by multiple orders of magnitude.